直 流 和 脉 冲 电 流 对 碳 酸 钙 电 沉 积 的 影 响

Electrochemical deposition of CaCO₃ is one of the methods to reduce scaling in industrial water system. The pulse current （PC）and direct current （DC）were used to study the electrodeposition process of CaCO₃，and the influence of different ions on PC electrodeposition of CaCO₃. The crystal morphology of CaCO₃ were characterized by SEM and XRD. The experimental results showed that the nucleation rate of CaCO₃ on 304SS electrode under PC is faster than that under DC，which promoted the ripening process of calcium carbonate. The addition of Fe³⁺，PO₄^3-，SiO₃^2- and Mg²⁺ accelerated the crystallization of CaCO₃，but decreased the density and thickness of the deposition. The ripening process of PC electrodeposition makes the crystallization tend to form layered calcite with larger particle size，and the calcite particle size is larger than that obtained by DC electrodeposition.